Re: [Xen-devel] About booting Xen with UEFI on FastModel

[Chen Baozi <baozich@xxxxxxxxx>]

On Dec 11, 2013, at 18:59, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:

> On Wed, 2013-12-11 at 13:06 +0800, Chen Baozi wrote:
>> Hi Ian,
>> 
>> On Dec 9, 2013, at 23:35, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
>> 
>>> On Mon, 2013-12-09 at 23:15 +0800, Chen Baozi wrote:
>>>> Hi all,
>>>> 
>>>> I noticed that upstream UEFI is now supported ARMv8 on FastModel.
>>>> I’ve tried it to boot Linux with it. And it works. But it seems
>>>> it still cannot load Xen hypervisor properly. I’m now looking for
>>>> the reasons. Is there any difference for a firmware to load Xen
>>>> and Linux kernel?
>>> 
>>> I think you are the first one to try Xen on EFI.
>>> 
>>> Are you using the EFI stub with Linux or are you launching via a
>>> bootloader e.g. Grub-EFI?
>> 
>> After reading the source code, I think it is neither the EFI stub
>> or a bootloader. A Linux Loader EFI application has been developed
>> for ARM in EFI.
> 
> Do you have a link? I'm curious.

Instructions to EFI on AArch64:

http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=ArmPlatformPkg/AArch64

And I’m using the git clone of its svn repository:

https://github.com/tianocore/edk2.git

Under the tree, the Linux Loader locates at:

ArmPkg/Application/LinuxLoader

> 
>> It is able to boot Linux either by tagged list or
>> dtb method. However, it hardcoded the start address of 0x80000 
>> when loading Linux kernel, which make it unworkable for Xen after
>> paging is enable. But I’m not sure whether there would be other
>> problems for it to boot Xen. And I’ll continue to work on it until
>> it can boot Xen successfully at the end.
> 
> Have fun ;-)
> 
>> (At least, there are early printk messages on the UART now, :-))
> 
>> 
>> Cheers,
>> 
>> Baozi


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